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cli: add --debug-libc to zig build

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This option is similar to `--debug-target` in letting us override
details of the build runner target when debugging the build system.
While `--debug-target` lets us override the target query, this option
lets us override the libc installation. This option is only usable in a
compiler built with debug extensions.

I am using this to (try to) test the build runner targeting SerenityOS.
This commit is contained in:
mlugg 2025-08-04 09:00:41 +01:00
parent dabae3f9dc
commit 32a069f909
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GPG key ID: 3F5B7DCCBF4AF02E
1 changed files with 18 additions and 0 deletions
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18
src/main.zig
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@ -4891,6 +4891,7 @@ fn cmdBuild(gpa: Allocator, arena: Allocator, args: []const []const u8) !void {
var fetch_mode: Package.Fetch.JobQueue.Mode = .needed;
var system_pkg_dir_path: ?[]const u8 = null;
var debug_target: ?[]const u8 = null;
var debug_libc_paths_file: ?[]const u8 = null;
const argv_index_exe = child_argv.items.len;
_ = try child_argv.addOne();
@ -5014,6 +5015,14 @@ fn cmdBuild(gpa: Allocator, arena: Allocator, args: []const []const u8) !void {
} else {
warn("Zig was compiled without debug extensions. --debug-target has no effect.", .{});
}
} else if (mem.eql(u8, arg, "--debug-libc")) {
if (i + 1 >= args.len) fatal("expected argument after '{s}'", .{arg});
i += 1;
if (build_options.enable_debug_extensions) {
debug_libc_paths_file = args[i];
} else {
warn("Zig was compiled without debug extensions. --debug-libc has no effect.", .{});
}
} else if (mem.eql(u8, arg, "--verbose-link")) {
verbose_link = true;
} else if (mem.eql(u8, arg, "--verbose-cc")) {
@ -5101,6 +5110,14 @@ fn cmdBuild(gpa: Allocator, arena: Allocator, args: []const []const u8) !void {
.is_explicit_dynamic_linker = false,
};
};
// Likewise, `--debug-libc` allows overriding the libc installation.
const libc_installation: ?*const LibCInstallation = lci: {
const paths_file = debug_libc_paths_file orelse break :lci null;
if (!build_options.enable_debug_extensions) unreachable;
const lci = try arena.create(LibCInstallation);
lci.* = try .parse(arena, paths_file, &resolved_target.result);
break :lci lci;
};
process.raiseFileDescriptorLimit();
@ -5365,6 +5382,7 @@ fn cmdBuild(gpa: Allocator, arena: Allocator, args: []const []const u8) !void {
}
const comp = Compilation.create(gpa, arena, .{
.libc_installation = libc_installation,
.dirs = dirs,
.root_name = "build",
.config = config,